OB Archives – The Broadcast Knowledge

It’s never been easy building a large OB van. Keeping within axel weight, getting enough technology in and working within a tight project timeline, not to mention keeping the expanding sections cool and water-tight is no easy task. Add on that social distancing thanks to SARS-CoV-2 and life gets particularly tricky.

This project was intriguing before Covid-19 because it called for two identical SMPTE ST-2110 IP trucks to be built, explains Geert Thoelen from NEP Belgium. Both are 16-camera trucks with 3 EVS each. The idea being that people could walk into truck A on Saturday and do a show then walk into truck B on Sunday and work in exactly the same show but on a different match. Being identical, when these trucks will be delivered to Belgium public broadcaster RTBF, production crews won’t need to worry about getting a better or worse truck then the other programmes.. The added benefit is that weight is reduced compared to SDI baseband. The trucks come loaded with Sony Cameras, Arista Switches, Lawo audio, EVS replays and Riedel intercoms. It’s ready to take a software upgrade for UHD and offers 32 frame-synched and colour-corrected inputs plus 32 outputs.

Broadcast Solutions have worked with NEP Belgium for many years, an ironically close relationship which became a key asset in this project which had to be completed under social distancing rules. Working open book and having an existing trust between the parties, we hear, was important in completing this project on time. Broadcast Solutions separated internet access for the truck to access the truck as it was being built with 24/7 remote access for vendors.

https://www.youtube.com/watch?v=QbUkCQ-Z5xo

Live-Talk System Integration: How to build two large Full-IP OB trucks (during COVID-19) (https://www.youtube.com/watch?v=QbUkCQ-Z5xo)

Axel Kühlem fro broadcast solutions address a question from the audience of the benefits of 2110. He confirms that weight is reduced compared to SDI by about half, comparing like for like equipment. Furthermore, he says the power is reduced. The aim of having two identical trucks is to allow them to be occasionally joined for large events or even connected into RTBF’s studio infrastructure for those times when you just don’t have enough facilities. Geert points out that IP on its own is still more expensive than baseband, but you are paying for the ability to scale in the future. Once you count the flexibility it affords both the productions and the broadcaster, it may well turn out cheaper over its lifetime.

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Speakers

	Axel Kühlem Senior System Architect Broadcast Solutions
	Geert Thoelen Technical Director, NEP Belgium

As you walk around any exhibitions there seems to be a myriad of ‘benefits’ of IP working, many of which don’t resonate for particular use cases. Only the most extraordinary businesses need all of the benefits, so in this talk, Imagine Communication’s John Mailhot discusses how IP helps sports venues.

John sets the scene by separating out the function of OB trucks and the ‘inside production’ facilities which have a whole host of non-TV production to do including driving scoreboards, displays inside the venue, replays and importantly has to deal with over 250 events a year, not all of which will have an OB truck.

We see that the scale that IP can work at is a great benefit as many signals can fit down one fibre and 2022-7 seamless switching can easily provide full redundancy for every fibre and SFP. This is a level of redundancy which is simply not seen in SDI systems. With stadia being very large, necessitating cable runs of over 500m, the fact that IP needs fewer cables overall is a great benefit.

John shows an example of an Arista switch only 7U in height which provides 144x 100G ports meaning it could support over 4000 inputs and 4000 outputs. Such density is unprecedented and for OB trucks can be a dealbreaker. For sports venues, this can also be a big motivator but also allow more flexibility in distributing the solution rather than relying on a massive central interconnect with a 1100×1100 SDI router in a central CTA.

TV is nothing without audio and the benefits to audio in 2110 are non trivial since with the audio being split off from the video, we are no longer limited to dealing with just 16 channels per video and de-embedding from a video frame any time we want to touch it.

Timing is an interesting benefit. I say this because, whilst PTP can end up being quite complex compared to black and burst, it has some big benefits. First off, it can live in the same cables as your data where as black and burst requires a whole separate cable infrastructure. PTP also allows you to timestamp all essences which helps with lip-sync throughout your workflow.

John leads us through some examples of how this works for different areas finishing by summing up the relevant benefits such as scalability, multi-format, space efficient, and timing amongst others.

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